Sir Malcolm Walker, 72, started this frozen food retailer in 1970 with £30. The north Wales company now has 884 stores, including its larger retail sites under the Food Warehouse brand, launched in 2014 and run by the founder’s son, managing director Richard Walker, 37. He has pledged to phase out environmentally unfriendly palm oil from Iceland’s own-brand products by the end of this year and plastic packaging by 2023.

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